GB/T 8421-2020Agricultural wheeled tractor, driver seat, laboratory measurement of transmitted vibration (English PDF)

1 Scope

This standard specifies a laboratory measurement and evaluation method for vibration reduction of the driver's seat suspension of agricultural wheeled tractors. This standard complies with

Requirements of GB/T 18707.1.This standard also specifies evaluation indicators based on test results, and clearly specifies input vibration, etc.

Level, involving three levels of rigid rear axles and agricultural rubber tire tractors without low-frequency damping cab units, less than 3600kg

Level 1, from 3600kg to 6500kg is level 2, and greater than 6500kg is level 3.Each type includes a group of tractors with similar vibration characteristics.

This method tests the damping effect of the seat suspension on the vertical vibration of the driver's whole body in the range of 1Hz~20Hz. This tester

The method does not apply to the vibration of the driver outside the seat (for example, the vibration of the driver's foot on the floor or control pedal or hand on the steering wheel).

Note. The test criteria of this standard are for the driver's seat of agricultural tractors for conventional design. Independent front or rear axle, or independent front and rear axles

Tractor, low-frequency cab suspension, these will produce very obvious different vibration characteristics. These vibration characteristics can be measured according to GB/T 10910, or

Use other methods to measure and evaluate seat suspension performance on this type of tractor.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.

For undated references, the latest version (including all amendments) applies to this document.

GB/T 13441.1-2007 Mechanical vibration and shock Evaluation of human exposure to whole body vibration Part 1.General requirements

GB/T 18707.1-2002 Laboratory method for mechanical vibration evaluation of vehicle seat vibration Part 1.Basic requirements

ISO 2041 Mechanical Vibration, Shock and Condition Monitoring Vocabulary

ISO 8041 Human response to vibration measuring instrument (Humanresponsetovibration-Measuringinstrumen- tation)

ISO 13090-1.1998 Mechanical Vibration and Shock Safety Guidelines for Human Testing and Testing Part 1.Mechanical Vibration

And human trials under repeated shocks

3 Terms and definitions

The following terms and definitions defined by ISO 2041 apply to this document.